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Monovalent ion selective cation exchange membrane as well as preparation method and application thereof

A cation exchange membrane, ion selectivity technology, applied in cation exchange, ion exchange, chemical instruments and methods, etc., can solve the problem of high membrane resistance, achieve small membrane resistance, high monovalent ion permeation flux, reduce reaction the effect of penetration

Active Publication Date: 2022-03-01
SHANDONG HORAN SUPER ENG PLASTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, although the construction of a surface selective layer with opposite charges on the membrane can improve the permeation selectivity of the membrane and increase the permeation flux of monovalent ions, it also brings the problem of high membrane surface resistance. The existing commercially available monovalent ions The surface resistance of the selective cation exchange membrane is about 4.2Ω / cm 2

Method used

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  • Monovalent ion selective cation exchange membrane as well as preparation method and application thereof
  • Monovalent ion selective cation exchange membrane as well as preparation method and application thereof
  • Monovalent ion selective cation exchange membrane as well as preparation method and application thereof

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preparation example Construction

[0041]In the present invention, the preparation method of the polysulfone-based membrane preferably includes the following steps:

[0042] The casting liquid is subjected to phase inversion to obtain the polysulfone-based membrane, the casting liquid includes polyethersulfone, sulfonated polysulfone and polar organic solvent, and the polyethersulfone and sulfonated polysulfone in the casting liquid The total mass percentage is 18~28%.

[0043] In the present invention, the casting solution includes a polar organic solvent. In the present invention, the polar organic solvent preferably includes N,N-dimethylformamide, N,N-dimethylacetamide and N - one or more of methylpyrrolidone.

[0044] In the present invention, in the casting solution, the total mass percentage of polyethersulfone and sulfonated polysulfone is preferably 18-28%, preferably 20-25%.

[0045] In the present invention, before the phase inversion, the present invention preferably carries out defoaming treatment...

Embodiment 1

[0102] according to figure 1 The process flow shown, to image 3 In the experimental equipment shown, polyethersulfone, sulfonated polysulfone (sulfonated degree of 20%) and dissolved N,N-dimethylformamide are mixed to obtain a casting solution, wherein polyethersulfone and sulfonated polysulfone The total mass percentage of sulfone is 23wt.%, the proportion of sulfonated polysulfone to the total mass of polyethersulfone and sulfonated polysulfone is 10%, the casting solution is defoamed for 12 hours, and the phase inversion is carried out under the condition of 20% air humidity for 24 hours , to obtain polysulfone base membrane;

[0103] Aqueous tannic acid solution with a mass percentage of 0.1wt.% was used as coating solution 1 to immerse the dense surface layer of the polysulfone-based membrane, and surface treated it for 10 minutes;

[0104] Remove the coating solution 1 and blow dry the surface of the film until it is clean and dry;

[0105] Continuing to immerse the ...

Embodiment 2

[0116] according to figure 1 In the process flow shown, polyethersulfone, sulfonated polysulfone (32% sulfonated degree) and dissolved N,N-dimethylformamide are mixed to obtain a casting solution, wherein polyethersulfone and sulfonated polysulfone The total mass percentage of sulfone is 20wt.%, the proportion of sulfonated polysulfone to the total mass of polyethersulfone and sulfonated polysulfone is 20%, the casting solution is defoamed for 18 hours, and the phase inversion is carried out under the condition of 30% air humidity for 28 hours , to obtain polysulfone base membrane;

[0117] The 3,4-dihydroxybenzoic acid aqueous solution with a mass percentage of 0.2wt.% is used as the coating solution 1 to immerse the dense surface layer surface of the polysulfone-based membrane, and it is surface-treated for 5 minutes;

[0118] Remove the coating solution 1 and blow dry the surface of the film until it is clean and dry;

[0119] Continuing to immerse the dense surface layer...

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Abstract

The invention belongs to the technical field of cation exchange membranes, and particularly relates to a monovalent ion selective cation exchange membrane as well as a preparation method and application thereof. The monovalent ion selective cation exchange membrane provided by the invention comprises a polysulfone base membrane, the polysulfone base membrane comprises a compact surface layer and a porous bottom layer, and the chemical composition of the polysulfone base membrane comprises polyether sulfone and sulfonated polysulfone; the positively charged selection layer is arranged on the dense surface layer side of the polysulfone-based membrane, the positively charged selection layer is obtained by carrying out amidation reaction and / or addition reaction on a polyphenol compound and a polyamine compound, and the number of amino groups in the polyamine compound is greater than or equal to 3; the negatively charged selection layer is arranged on the porous bottom layer side of the polysulfone-based membrane and is obtained by carrying out polymerization reaction on piperazine and / or a diamine compound and acyl chloride. The monovalent ion selective cation exchange membrane provided by the invention has the characteristics of high monovalent ion permeation flux and small membrane surface resistance.

Description

technical field [0001] The invention belongs to the technical field of cation exchange membranes, and in particular relates to a monovalent ion selective cation exchange membrane and its preparation method and application. Background technique [0002] Membrane separation technology has great development potential and good application background due to its advantages of simple application and operation, wide application range, high selectivity, small footprint, good stability, green pollution-free and low energy consumption. Various separation membranes such as microfiltration membranes, nanofiltration membranes, ultrafiltration membranes, reverse osmosis membranes, pervaporation membranes, and gas separation membranes have been applied in industry, and ion exchange membranes are one of the most advanced separation membranes. [0003] Generally, ordinary ion exchange membranes do not have selective permeability to ions of different valence states. For example, conventional c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44B01D67/00B01D69/02B01D71/68B01J39/19
CPCB01D71/68B01D67/0093B01D69/02B01D67/0083B01D61/44B01J39/19B01D2325/42
Inventor 邵路杨帆党国栋孙博邓立君
Owner SHANDONG HORAN SUPER ENG PLASTICS
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